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Spectroscopy and photochemistry of astrophysically-relevant molecules of the cyanoactylene family

Abstract : Several astrochemically interesting molecules of the cyanoacetylene family have been characterized spectroscopically. Photochemical studies involving these molecules have also been performed. The cryogenic rare-gas matrix isolation technique was employed for the preparation of most of the samples. The tudied molecules were: CH₃C₃N (and some of its isomers), CH₃C₅N, HC₅N – all available via preparative organic chemical synthesis, as well as those that appeared as the products of photochemical reactions run mostly in solid Kr: HC₉N, starting from C₄H₂ + HC₅N, and C₁₀N₂, starting from either C₄H₂ + HC₅N or HC₅N + HC₅N. The method was further extended to the synthesis of methylated compounds with formation of CH₃C₅N from CH₃C₂H + HC₃N, and CH₃C₇N from CH₃C₂H + HC₅N. In addition, photochemical experiments using HC₅N containing matrices led to the detection of HC₇N and of the C₅N⁻ anion. A general scheme describing the chain elongation processes was formulated. Similarities or differences in selection rules, vibronic spacings, electronic transition energies, and phosphorescence decay times were examined for the homologous series HC₂n+₁N, NC₂nN and CH₃C₂n+₁N.
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https://tel.archives-ouvertes.fr/tel-01562041
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Submitted on : Thursday, July 13, 2017 - 3:12:12 PM
Last modification on : Wednesday, October 14, 2020 - 3:39:55 AM
Long-term archiving on: : Friday, January 26, 2018 - 5:50:20 PM

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Urszula Szczepaniak. Spectroscopy and photochemistry of astrophysically-relevant molecules of the cyanoactylene family. Chemical Physics [physics.chem-ph]. Université Paris Saclay (COmUE); Polish Academy of Sciences, 2017. English. ⟨NNT : 2017SACLS128⟩. ⟨tel-01562041⟩

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